feat: highlight available tile placements

2 files changed, 9 insertions, 1 deletions

diff --git a/src/board.h b/src/board.h
index 3d3fdc2..a8505e5 100644
--- a/src/board.h
+++ b/src/board.h
@@ -13,6 +13,7 @@ typedef struct {
 static const char EMPTY = ' ';
 static const char ANY = '*';
 static const char SEPARATOR = '+';
+static const char PREVIEW_AVAILABLE = '@';
 
 static const int NEIGHBOR_INCREMENTS[] = { -BOARD_ROW_UNITS, 1, BOARD_ROW_UNITS, -1 };
 
diff --git a/src/main.c b/src/main.c
index 4f60ba1..170ffea 100644
--- a/src/main.c
+++ b/src/main.c
@@ -49,8 +49,15 @@ int main() {
         board_preview[i].feature = board[i].feature;
         board_preview[i].structure_group = board[i].structure_group;
       }
-      place_tile(tile, translate_coordinate(position), board_preview, 1);
 
+      /* highlight available placements */
+      for (int k = 0; k < BOARD_WIDTH * BOARD_WIDTH; k++) {
+        if (is_allowed_placement(tile, translate_coordinate(k), board)) {
+          board_preview[translate_coordinate(k)].feature = PREVIEW_AVAILABLE;
+        }
+      }
+
+      place_tile(tile, translate_coordinate(position), board_preview, 1);
       int is_allowed = is_allowed_placement(tile, translate_coordinate(position), board);
 
       if (is_allowed) wattron(board_win, COLOR_PAIR(2));